CN1994026A - Method and circuit arrangement for operating a discharge lamp - Google Patents
Method and circuit arrangement for operating a discharge lamp Download PDFInfo
- Publication number
- CN1994026A CN1994026A CNA2005800266930A CN200580026693A CN1994026A CN 1994026 A CN1994026 A CN 1994026A CN A2005800266930 A CNA2005800266930 A CN A2005800266930A CN 200580026693 A CN200580026693 A CN 200580026693A CN 1994026 A CN1994026 A CN 1994026A
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- lamp
- frequency
- operation phase
- discharge lamp
- circuit arrangement
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
- H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
- H05B41/2928—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
A method and a circuit arrangement are described for operating a discharge lamp is described, especially a high-intensity discharge lamp or lamps (HID) or UHP [ultra high performance] -lamp, which is/are distinguished by a first and a second operating phase with a higher first or a lower second frequency of the lamp AC, wherein the operating phases are activated alternatingly at defined intervals and for defined periods of time, in order to achieve a stable arc discharge and only a low burnout or rise in burning voltage of the lamp during its life by configuring certain forms of electrode tips. Furthermore, are described an illumination unit with a discharge lamp and such a circuit arrangement as well as a projection system with a projection display and such an illumination unit.
Description
Technical field
The present invention relates to a kind of Method and circuits device of operated discharge lamp.Method of the present invention and circuit arrangement of the present invention especially can be used for HID (high intensity discharge) lamp or UHP (very-high performance) lamp.The invention still further relates to lighting unit and have the projection display and the optical projection system of this lighting unit with discharge lamp and sort circuit device.
Background technology
Basically can operate this lamp with DC and AC.Yet, usually, preferably with the AC operation, because avoided the corrosion of electrode also can improve the efficient of lamp like this.
Yet the danger that causes launching the unstable arc discharge of light stream flicker has also increased, especially when moving with AC, owing to the constant variation of polarity.This mainly is due to the fact that: arc discharge depends on the surface state of temperature and electrode, and, electrode as anodal and negative pole work mutually in, the time dependent pattern difference of electrode temperature.This causes the marked change of electrode temperature when lamp current cycle conversely.For being changed, these produce favorable influence, be known that, when each half period of lamp current finishes, just, before change in polarity, the half period that has produced and will change has the power pulse of identical polar, and it is superimposed upon on the lamp current, makes total current increase and the electrode temperature rising.This can significantly improve the stability of arc discharge.
The effect of these power pulses is that lamp operates under the lamp AC that more or less demonstrates the pulse type component strongly, and it produces the light stream that pulse type strengthens conversely.
Especially in the sequential color projection display by the work of sequential colorization replay method, yet if for example reappear one of them basic coloured image with the different brightness that are different from other base image, the variation of launching light stream may make the outward appearance distortion.
Summary of the invention
Therefore, the objective of the invention is to invent a kind of Method and circuits device of operated discharge lamp, can obtain stable arc discharge by this Method and circuits device, and the power pulse that needn't on lamp current, superpose for this purpose.
And, for the operated discharge lamp, for the present invention should be possible provide a kind of Method and circuits device, by this Method and circuits device, can reduce significantly or be limited at least lamp the life period electrode burn out relevant rising with keep-alive voltage.
The method that is used for the operated discharge lamp according to claim 1 realizes this purpose, this discharge lamp has first operation of the first frequency of lamp AC to be operated mutually with second of the second frequency with lamp AC mutually, wherein select first frequency, make in lamp operating period, on electrode body, form thin eletrode tip, during wherein to second frequency the tip at least melt back most of and after predetermined period, start second and operate phase through the first operation phase.
In claim 11, further realize this purpose by the circuit arrangement of carrying out this method.
Use technical scheme of the present invention, can be at relative high frequency (wherein this frequency can be significantly higher than the frequency of the lamps known AC that superposes with the power pulse above-mentioned) operating light of lamp AC, make and to use and its advantages associated, just, since thinner eletrode tip and on electrode lower voltage drop cause the more stable arc discharge of major part, and needn't accept relevant with high frequency usually defective (the most important thing is serious electrode burn and cause quite frequent electric arc jump or unsettled arc discharge) owing to form a plurality of eletrode tips.Can obtain these advantages, and on the lamp AC that needn't in known manner power pulse be added to.
Because alternately starting and especially suitable selection and second operation repetition rates mutually of duration of two operation phases, can also significantly reduce or be limited in the rising of keep-alive voltage of the life period lamp of lamp.
Dependent claims comprises other favourable research and development of the present invention.
Claim 8 and 9 comprises making operation mutually, if not in continued operation and just use lamp in each relatively shorter cycle, preferably replaces second to operate and start the making operation phase mutually turn-on lamp after.
With reference to the embodiment that hereinafter describes, by the example of indefiniteness, these and other scheme of the present invention is conspicuous and is explained.
Description of drawings
In the drawings:
Fig. 1 has provided the diagram of first eletrode tip;
Fig. 2 has provided the diagram of second eletrode tip;
Fig. 3 shows the keep-alive voltage of lamp and the curve chart of time;
Fig. 4 show a plurality of operating period lamp keep-alive voltage and the curve chart of time, and
Fig. 5 shows the basic circuit diagram of the circuit of the circuit arrangement that is used for implementation method.
Embodiment
Fig. 1 and 2 shows the opposed facing end region of two electrodes 1 of (high strength) gaseous discharge lamp, forms the arc discharge (not shown) when mode of operation between them.
In the operating period of discharge lamp, spike 11,12; 11a appear at electrode body 10 before on the surface that faces one another, spike 11,12; The growth of 11a, just length and diameter depend on a plurality of operating parameters of lamp, and may cause desirable or undesirable characteristic in the lamp.
Shown width that forms eletrode tip or the frequency f that diameter depends on lamp AC, a bit the following equation of picture:
Wherein constant c about 2500 and about 4000 μ m between.
Therefore, by for example using approximately 300Hz and the approximately high relatively frequency of operation between the 1000Hz, can produce eletrode tip with relative minor diameter, and use for example about 20 to 150 or 200Hz between low relatively frequency of operation, can produce and have large diameter relatively tip.
The shortcoming at the relatively thicker tip relative with the apicule end is: on the direction of electrode body 10, quite a lot of from the free-ended heat transfer at thick tip.
High-intensity operation by lamp with in the thick relevant diffuse arc adhesion of eletrode tip, the result is that the voltage drop on the electrode is very big, electrode temperature sharply rises, so electrode material evaporates in large quantities.
And because relatively large heat transfer, the especially relatively low lamp power supply and the arc adhesion of related pointed are so be lower than situation about having than the tip of minor diameter in thick most advanced and sophisticated free-ended temperature.The result of this situation is: for thicker tip, the danger that electric arc jumps is apparently higher than the apicule end.Add this point, the peak swing that electric arc jumps increases along with the diameter of eletrode tip and rises.
Therefore, in the situation of the electrode with relative apicule end, people can observe metastable arc discharge and relative low voltage drop on electrode.
Do not consider the thickness of eletrode tip, yet the result of the high relatively operating voltage of lamp AC is normally such, especially after the long operation cycle, can observe the electrode (having increased keep-alive voltage thus) that more seriously burns out and/or form thin relatively spike usually on electrode, electric arc jumps between electrode everywhere then.
Circuit arrangement of the application of the invention and method of the present invention have been avoided this situation at least to a great extent, the feasible described advantage that can use high relatively frequency of operation, and needn't accept its shortcoming and the lamp AC that needn't in known manner potential pulse be added to last (especially before each reversing).
For this purpose, be provided with and change or operating parameter, the especially frequency of lamp AC of control lamp, make the shape that eletrode tip takes Fig. 1 and 2 to be used alternatingly.
In the situation of first electrode shape shown in Figure 1, the free end at electrode body 10 has constituted the first thick relatively eletrode tip 11, has formed the second thin relatively eletrode tip 12 in the above.
In the situation of second electrode shape shown in Figure 2, the second thin eletrode tip 12 has melted, its material major part is deposited on the first thick eletrode tip 11, makes to have formed a third electrode most advanced and sophisticated 11a with diameter bigger than the diameter of first eletrode tip 11 of Fig. 1 now.
Alternate between these two electrode shapes has been avoided the formation of a plurality of spikes and has been avoided formation electric arc to jump at least, because it also limits or has reduced the life period electrode burnout of lamp and relevant keep-alive voltage rising.
The preferred operating parameter of selecting the appropriate frequency of lamp AC as lamp alternately produces with proper spacing and cycle and starts these electrodes by means of these frequencies and forms.
Especially produce the second thin relatively eletrode tip 12 shown in Fig. 1, can, high relatively first frequency f in the scope between about 300Hz and the about 3000Hz utilized
1The first operation phase manipulate lamp at lamp AC.
For fear of at high frequency f
1The time lamp continued operation above-mentioned defective, in the second operation phase (looks again) at a certain time interval with the frequency inverted of lamp AC to low relatively second frequency f
2, make the second thin eletrode tip 12 melt, its material major part at least is deposited on the first thick eletrode tip 11.By this way, produce the most advanced and sophisticated 11a of thick third electrode shown in Figure 2 in addition, it has usually less times greater than the diameter of the diameter of first eletrode tip 11 shown in Figure 1.
Second frequency f
2Can be about 0 and the about scope between the 300Hz, preferably about 20 with approximately between the 200Hz, perhaps at about first frequency f
11/20 and about 1/2 between.Can be with first frequency f
1Be defined as second frequency f
2Integral multiple (f
1=n*f
2).
Alternatively or additionally, in second operation mutually, can also to lamp apply its duration about 0.1 and about 10 seconds between the DC component.This DC component is preferably with first with then with opposite second polarity operation.
If obtained electrode shape shown in Figure 2 at least basically, change the first operation phase so once more, make to form the second thin eletrode tip 12 once more.
According to the type of lamp, about 0.5 and about 10 hours between first the operation phase duration after, preferably have start regularly second the operation phase, wherein second the operation preferably have mutually about 0.1 and about 3600 seconds between duration.
Preferably the situation of using lamp at least basically with continuous mode and lamp connect the quite short time and and then the situation of turn-offing between produce difference.In the former situation, expended the operation cycle of lamp, and after the described cycle of the first operation phase, before turning back to first operation mutually, started the second operation phase of described duration.On the other hand, then preferred just before using first operation mutually if lamp only moves the quite short cycle, second operation mutually can be always starts with the form of the making operation phase after the turn-on lamp.
Above-mentioned operating parameter also is set especially, makes because than the slightly limited horizontal expansion of the most advanced and sophisticated 11a of third electrode, so during first operation mutually, do not form a plurality of thin eletrode tips.
Fig. 3 show the keep-alive voltage U (volt) of high-intensity discharge lamp and time T (hour) curve chart, the higher first frequency f of lamp AC during first operation mutually that is labeled as " I " wherein
1Approximately be 500Hz, and during second operation mutually that is labeled as " II " lower second frequency f
2Approximately be 90Hz.
What can clearly be seen that is that during the first operation phase I of each about one hour duration, keep-alive voltage U begins to be reduced to about 72 to 74 volts value from about 80 to 81 volts value.Because the second operation phase II of about 15 minute duration when each startup has reached this low keep-alive voltage, so thin second eletrode tip 12 fusings of formation shown in Figure 1, and produce or produce again the most advanced and sophisticated 11a of thicker third electrode shown in Figure 2 by this way, make keep-alive voltage be elevated to about 80 to 81 volts value once more.
Fig. 4 shows the diagram of time compression of figure of average keep-alive voltage that operation for three kinds of patterns has 150 watts UHP lamp.
In the zone that is labeled as " 1 " (first kind of operator scheme), lamp is only at the high first frequency f corresponding to the 500Hz lamp AC of the above-mentioned first operation phase
1Operation.Can find out at an easy rate, as mentioned above, after quite long operation mutually, be approximately 40 working hours here, because electrode burnout, so keep-alive voltage raises comprehensively.
For second kind of operator scheme, obtain the figure of the average operation voltage U shown in the zone " 2 ", wherein said first operation is along with the second operation phase change.In first operation mutually, lamp AC also has the first frequency f of 500Hz
1Yet, second frequency f
2In first operation mutually is 90Hz.Approximately started mutually about 90 seconds of second operation in per two hours.
It is evident that, the zone " 2 " (second operator scheme) in, the rising of keep-alive voltage and thus burning out significantly of electrode reduce.Thin eletrode tip 12 melted respectively during second operation was mutually represented in jump in the figure of keep-alive voltage.
At last, for the third operator scheme, at the figure of on average lighting voltage U shown in the zone " 3 ", except only approximately starting in per 11 hours second operation mutually, it is corresponding to second kind of pattern.
What can know clearly is, owing to be not that frequent like that looks again (has low second frequency f
2The second operation phase) (and electrode burn-back more seriously), so keep-alive voltage U in the process of quite long operation phase (about here 200 hours) than (zone " 2 ") rapider rising in second kind of pattern.Yet this rising still is lower than the situation (zone " 1 ") of first kind of pattern, regeneration wherein do not occur, and has only started the high first frequency f of lamp AC
1(the first operation phase).
If in the life of lamp, be reduced in the low second frequency f of the lamp AC that starts in second operation mutually
2,, then can further reduce the described long-term rising in the keep-alive voltage for example from initial 90Hz to 80 or 70Hz.
During regulating mutually (in factory etc.) produce (just the preferred first time that the most advanced and sophisticated 11a of thick relatively third electrode occurs, especially the first time after it is made is after the turn-on lamp), wherein for example from about scope of 20 to 200Hz, preferred 90Hz, between about 0.1 and 10 minute or if desired even the quite long time cycle, at the low relatively regulating frequency f of lamp AC
KAfter Shi Shouxian connects, running indicator.Then according to about 2*f
KWith about 15*f
KScope in regulating frequency f
KValue, the high first frequency f of the first operation phase that can the preferred definition back
1
If desired, stack has identical polar and the about power pulse of duration of 6% in cycle in the adjusting mutually in each cycle of lamp AC that can be before reversing, to improve the stability of arc discharge during this adjustings phase.
Replacedly, also possible is, by molded electrode material suitably, in the process of making lamp, produces thick third electrode tip 11a.
Provide the example of the preferred amount of UHP lamp operation below.After turn-on lamp, making operation mutually in it at first about 20 and about the 3rd frequency f of the lamp AC between the 200Hz
3, preferably approximately during 100Hz, move about 0.1 to 10 minute, preferably approximately 90 seconds.The 3rd frequency f during second operation mutually
3Usually can also equal regulating frequency f
KPerhaps second frequency f
2, and be used for producing the most advanced and sophisticated 11a of thick third electrode.
Start the first operation phase subsequently, wherein lamp AC has the first frequency f of about 500Hz
1For example, after the process predetermined period of time of about four hours time, before first operation mutually that changes subsequently, with the second frequency f of about 100Hz
2Start mutually about 90 seconds cycle of second operation.
Fig. 5 shows the schematic block circuit diagram of embodiment of the critical piece of circuit arrangement and optical projection system at last, and wherein this circuit arrangement is from being present in the AC voltage U of circuit arrangement input
Ac, for example about 100 to 240 volts, produce the lamp AC that is used for discharge lamp 31 with said frequencies.
Circuit arrangement comprises rectifier stage 10, power/current controller 11, electric pressure converter 12, control unit 20, has the transducer 30 and the image processor 40 of the level of lighting, and exists the signal V of the video/graphics that will show to be used to produce image on this image processor.
The AC voltage U
AcChange into dc voltage by rectifier stage 10.By this dc voltage, power/current controller 11 produces DC, and having for discharge lamp 31 these DC can the electric current relevant with power/current controller 11, is wherein regulating mutually or the making operation DC that as required power pulse is added to during mutually.For this purpose, thus by control unit 20 control power/current controllers 11.
By means of transducer 30 DC that produces is changed into the lamp AC that is mainly rectangle, it has corresponding to regulating afterwards above-mentioned mutually (first or second) that alternately starts of phase or making operation operates first or second frequency f of phase
1, f
2
The voltage supply that is used as power/current controller 11 to the electric pressure converter 13 of rectifier stage 10 is presented in use.
Optical projection system is made of discharge lamp 31, light integrator 32, color modulator 33, display 34 and lens combination 35 basically.Image processor 40 is according to existing video/graphics signal V thereon to control color modulator 33 and display 34 in known manner.
As required, can also be with the keep-alive voltage of original known mode supervisory lamp 31, so that in the situation that begins according to the present invention to raise, according to operating with respect to the above-mentioned explanation during the original definition value, reduce second frequency f second
2
When use was used for the discharge lamp of lighting unit of optical projection system, during the lamp power supply, it was easy to light beats reaction (for example DLP and LCOS system), about frequency of operation f
1And f
2Selection should preferably note following:
For fear of light beats, fault image or other image disruption, respectively in first and second frequency f of first or second operation in mutually
1, f
2It is respectively the integral multiple of picture frequency.
In a similar fashion, can also define the 3rd frequency f of making operation phase
3Yet, because the short usually duration of making operation phase, so its is not very crucial synchronously.
At last, the circuit arrangement of carrying out method of the present invention comprises control unit 20 especially, has the microprocessor or the microcontroller of software program, can carry out or control the method step of being explained by means of this microprocessor or microcontroller.
Claims (13)
1, a kind of have the first frequency (f of lamp AC
1) first operation mutually and have the second frequency (f of lamp AC
2) the method for the second operation phase operated discharge lamp, first frequency (f wherein
1) be selected as making and go up the thin eletrode tip (12) of formation at the lamp run duration at electrode body (10), wherein arrive second frequency (f
2) time, most advanced and sophisticated by melt back most of at least and after predetermined period, start second and operate phase through the first operation phase.
2, the method for claim 1, wherein first frequency (f
1) at approximately 300Hz and the approximately scope between the 3000Hz, and be preferably about 500Hz.
3, the method for claim 1, wherein second frequency (f
2) at approximately 0Hz and the approximately scope between the 300Hz, and be preferably about 90Hz.
4, the method for claim 1, wherein first frequency (f
1) be second frequency (f
2) integral multiple.
5, method as claimed in claim 3 wherein at the life period of lamp, reduces second frequency (f according to the rising of the keep-alive voltage of lamp
2).
6, the method for claim 1 wherein starts the second operation phase after the operation cycle of the first operation phase between about 1/2 hour and about ten hours regularly.
7, the method for claim 1, wherein about 0.1 and about 3600 seconds between duration start the second operation phase.
8, the method for claim 1, wherein the form with the making operation phase starts the second operation phase after lamp is connected.
9, method as claimed in claim 8, wherein about 0.1 and about 10 minutes between duration, started the making operation phase in preferably approximately 90 seconds.
10, a kind of data processor device with procedure code, when program was loaded on microcomputer or the microcontroller, enforcement of rights required 1 to 9 at least one described method.
11, a kind of circuit arrangement is used for each the described method operation discharge lamp according to claim 1 to 9.
12, a kind of lighting unit has high-intensity discharge lamp and circuit arrangement as claimed in claim 11.
13, a kind of optical projection system has the projection display and lighting unit as claimed in claim 12.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP04103803.5 | 2004-08-06 | ||
| EP04103803 | 2004-08-06 | ||
| PCT/IB2005/052604 WO2006016335A1 (en) | 2004-08-06 | 2005-08-04 | Method and circuit arrangement for operating a discharge lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1994026A true CN1994026A (en) | 2007-07-04 |
| CN1994026B CN1994026B (en) | 2012-06-06 |
Family
ID=35287043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005800266930A Expired - Fee Related CN1994026B (en) | 2004-08-06 | 2005-08-04 | Method and circuit arrangement for operating a discharge lamp |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US7714522B2 (en) |
| EP (1) | EP1776848B1 (en) |
| JP (1) | JP4700056B2 (en) |
| CN (1) | CN1994026B (en) |
| AT (1) | ATE407544T1 (en) |
| DE (1) | DE602005009546D1 (en) |
| WO (1) | WO2006016335A1 (en) |
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| CN102576645A (en) * | 2009-09-17 | 2012-07-11 | 欧司朗股份有限公司 | Low-pressure Discharge Lamp |
| CN101690412B (en) * | 2007-07-10 | 2013-04-10 | 皇家飞利浦电子股份有限公司 | Method and driving unit for driving a gas-discharge lamp |
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| JP2003338394A (en) * | 2002-05-21 | 2003-11-28 | Matsushita Electric Ind Co Ltd | Method for lighting high-pressure discharge lamp, lighting device and high-pressure discharge lamp device |
| JP4186578B2 (en) * | 2002-10-09 | 2008-11-26 | ウシオ電機株式会社 | High pressure discharge lamp lighting device |
| JP4171285B2 (en) * | 2002-11-06 | 2008-10-22 | フェニックス電機株式会社 | High pressure discharge lamp lighting method and lighting device |
| JP4244747B2 (en) * | 2002-11-08 | 2009-03-25 | ウシオ電機株式会社 | High pressure discharge lamp lighting device |
-
2005
- 2005-08-04 WO PCT/IB2005/052604 patent/WO2006016335A1/en active IP Right Grant
- 2005-08-04 DE DE602005009546T patent/DE602005009546D1/en active Active
- 2005-08-04 AT AT05780821T patent/ATE407544T1/en not_active IP Right Cessation
- 2005-08-04 CN CN2005800266930A patent/CN1994026B/en not_active Expired - Fee Related
- 2005-08-04 EP EP05780821A patent/EP1776848B1/en not_active Not-in-force
- 2005-08-04 US US11/573,014 patent/US7714522B2/en not_active Expired - Fee Related
- 2005-08-04 JP JP2007524457A patent/JP4700056B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101690412B (en) * | 2007-07-10 | 2013-04-10 | 皇家飞利浦电子股份有限公司 | Method and driving unit for driving a gas-discharge lamp |
| CN101810059A (en) * | 2007-09-26 | 2010-08-18 | 皇家飞利浦电子股份有限公司 | Be used to use light source method of transferring data and equipment |
| CN101810059B (en) * | 2007-09-26 | 2016-06-22 | 皇家飞利浦电子股份有限公司 | For the method and apparatus using light source transmission data |
| CN101861037A (en) * | 2009-04-01 | 2010-10-13 | 优志旺电机株式会社 | High-pressure discharge lamp operation device |
| CN102576645A (en) * | 2009-09-17 | 2012-07-11 | 欧司朗股份有限公司 | Low-pressure Discharge Lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE407544T1 (en) | 2008-09-15 |
| CN1994026B (en) | 2012-06-06 |
| US20090009095A1 (en) | 2009-01-08 |
| JP4700056B2 (en) | 2011-06-15 |
| EP1776848A1 (en) | 2007-04-25 |
| US7714522B2 (en) | 2010-05-11 |
| DE602005009546D1 (en) | 2008-10-16 |
| WO2006016335A1 (en) | 2006-02-16 |
| JP2008509518A (en) | 2008-03-27 |
| EP1776848B1 (en) | 2008-09-03 |
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